diff --git a/scripts/azure-pipelines/osx/Setup-VagrantMachines.ps1 b/scripts/azure-pipelines/osx/Setup-VagrantMachines.ps1
index 4e675660cb11b3..c44858044164b3 100755
--- a/scripts/azure-pipelines/osx/Setup-VagrantMachines.ps1
+++ b/scripts/azure-pipelines/osx/Setup-VagrantMachines.ps1
@@ -75,7 +75,7 @@ Param(
     [String]$BoxName = 'vcpkg/macos-ci',
 
     [Parameter()]
-    [Int]$DiskSize = 350,
+    [Int]$DiskSize = 250,
 
     [Parameter()]
     [Switch]$Force
diff --git a/scripts/azure-pipelines/osx/configuration/Vagrantfile b/scripts/azure-pipelines/osx/configuration/Vagrantfile
index f5ff39ff394af4..08c472fe6d6bd7 100644
--- a/scripts/azure-pipelines/osx/configuration/Vagrantfile
+++ b/scripts/azure-pipelines/osx/configuration/Vagrantfile
@@ -50,7 +50,7 @@ Vagrant.configure('2') do |config|
   # to do this. When vagrant finishes the `disk` feature, switch
   # over to that -- Nicole Mazzuca
   if (not File.exists? diskname) then
-    system "VBoxManage createmedium --filename #{diskname} --size #{1024 * server[:disk_size]}"
+    system "VBoxManage createmedium --filename #{diskname} --size #{1024 * server[:disk_size]} --variant Fixed"
   end
 
   config.vm.provider 'virtualbox' do |vb|